DE — DelawareDelaware Personal Income Tax Extension — What You Need to Do
Delaware extends your personal income tax filing deadline to October 15, 2026 — but the extension is tied to your federal one. You qualify automatically if you already have a federal extension (IRS Form 4868) and owe no Delaware tax. If you owe a balance, or don’t file federally, you must file Delaware Form PIT-EXT with payment. Note Delaware’s original deadline is April 30 — later than the federal April 15 — and any tax you owe is due that day, with interest running from April 30.
Delaware Extension Checklist — 2026
Three things to handle. One deadline that drives them all.
Secure Your Extension
File a federal extension (IRS Form 4868) and, if you owe no Delaware tax, your state deadline moves to October 15 automatically — no separate form needed. If you owe a balance or won’t file federally, submit Delaware Form PIT-EXT with payment by April 30.
Pay Any Delaware Tax You Owe
Delaware’s extension covers filing — not payment. A 1%-per-month failure-to-pay penalty (up to 25%) and 0.5%-per-month interest apply to any unpaid balance from April 30. Pay as much as possible by April 30.
Credit / Debit Card
Pay by card through the Delaware Taxpayer Portal — a convenience fee applies.
Check with Form PIT-EXT State of Delaware
Division of Revenue
P.O. Box 830
Wilmington, DE 19899-0830
File Federal + Delaware Return
File your federal return and add your Delaware return — Form PIT-RES (residents) or PIT-NON (nonresidents / part-year) — in the same session. Filing sooner means a faster refund. Your extended Delaware deadline is October 15.
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Delaware Late Penalties — What It Costs to Wait
A valid extension gives you until October 15 to file. But unpaid tax starts accruing penalty and interest the day after April 30.
| Penalty Type | Rate | Cap | Trigger |
|---|---|---|---|
| Failure to Pay | 1% per month | 25% | Unpaid balance after April 30 |
| Failure to File | 5% per month | 50% | Filing late without a valid extension |
| Interest | 0.5% per month | No cap | Accrues from April 30 until paid |
Delaware State Extension Details
| Extension Type | Federal Required — or PIT-EXT |
| Original Filing Deadline | April 30, 2026 |
| Extended Filing Deadline | October 15, 2026 |
| Extension Period | 5½ months |
| Extension Form | None with federal Form 4868 (no balance due); otherwise PIT-EXT (by April 30) |
| Return Form | PIT-RES (resident) / PIT-NON (nonresident, part-year) |
| Federal Extension Required? | A federal 4868 auto-extends Delaware if you owe nothing; otherwise file PIT-EXT with payment |
| Payment Deadline | April 30, 2026 (extension does not extend payment) |
| Online Payment Portal | tax.delaware.gov |
| State Agency | Delaware Division of Revenue |
| Failure to File Penalty | 5% per month, up to 50% |
| Failure to Pay Penalty | 1% per month, up to 25% (plus 0.5%/month interest) |
Delaware Tax Extension — Frequently Asked Questions
Do I need to do anything to get the Delaware extension?
If you have a federal extension (IRS Form 4868) and owe no Delaware tax, Delaware automatically extends your deadline to October 15, 2026. If you owe a balance or don’t file federally, file Form PIT-EXT with payment by April 30.
What is Form PIT-EXT?
It’s Delaware’s Application for Automatic Extension of Time to File (formerly Form 1027). File it by April 30 with any balance due — you can file and pay online at tax.delaware.gov.
Does the Delaware extension cover my federal return?
No. A Delaware extension only covers your state return. For more time on your federal return, file IRS Form 4868 — which also secures your Delaware extension if you owe nothing.
What if I can’t pay my full Delaware tax by April 30?
Pay as much as you can. Delaware charges a 1%-per-month failure-to-pay penalty (up to 25%) plus 0.5%-per-month interest on the unpaid balance from April 30, so every dollar paid by April 30 lowers your total.
Which Delaware return form do I need?
Form PIT-RES is for full-year residents. Form PIT-NON is for nonresidents and part-year residents. Both are due by the extended deadline of October 15, 2026.
Why is Delaware’s deadline April 30 instead of April 15?
Delaware sets its individual income tax filing and payment deadline at April 30 by statute — about two weeks after the federal date. Plan your payment and extension around April 30, not April 15.
Ready to File? Start Federal + Delaware
File your federal return and add Delaware state in the same session. October 15 extended deadline — secure, fast, with live support.